You will want to water them more in the first few weeks while they grow feeder roots. And if you keep the temps down so they stay somewhat dormant, they won't have as much need for water.
What I suggest that you do is that you fully water one and then pick-up the bag. You can gauge how dry they are based on the weight of the bag - they get a lot lighter when there is little moisture. You could probably almost use a scale to know when to water.
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